Originally posted by grayfox
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Sierra 107 TMK
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A low SD (I like <10) and a low ES (prefer in the teens) indicate that the load is exiting the barrel very consistently, which means it should give you good accuracy as well. COAL is the next variable in line to adjust, this tweaks the timing of the bullet exit, so together they should give you an accurate load."Down the floor, out the door, Go Brandon Go!!!!!"
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Originally posted by grayfox View PostA low SD (I like <10) and a low ES (prefer in the teens) indicate that the load is exiting the barrel very consistently, which means it should give you good accuracy as well. COAL is the next variable in line to adjust, this tweaks the timing of the bullet exit, so together they should give you an accurate load.
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I have yet to make it out to shoot the TAC loads I made up awhile back.
If it’s not windy or someone is ill or social obligations or....
I’m hoping there is a .75” load in the set otherwise this bullet might become a lightweight Creedmoor load for a bolt action gun.
I wish more folks were trying it out and posting itty bitty groups but it looks like this is going to be a finicky bullet in semi auto (mag length limited) configs
Again I hope I’m wrong ...
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I just ran a break-in load for my new lilja barrel with Tac and the 107 Sierra matchking at 2500 feet per second. Best groups I've got with the 107 yet three or four Cloverleaf groups and that's on barrel break in. I loaded lower charges round 25.7 so it's got a lot of room to go
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Originally posted by Sticks View PostI'd be contacting Sierra at this point. That's worse than and undersized Wolf pill with .2 grain variance and inconsistent neck tension. At least those print 1.5" out of a high end barrel.
There is no way that 3" groups are acceptable for any TMK.... I am really surprised from XBR too.
I get Factory 2nds from the back office at Sierra all the time and when I get home and throw them on the scale the most I ever see is .5 grain difference per 100 IF that.
What barrel are you using and did you put this rifle together yourself?
Does it shoot MOA with other loads?
have you tried other powders?― George Orwell
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